Abstract: This invention provides a key-code outputting apparatus for a data processor of the type wherein two or more kinds of characters are assigned to each key of a keyboard connected to the data processor, and different kinds of characters can be inputted from one key by using a character input mode or by using conjointly a function key and a shift key. The key-code outputting apparatus includes a memory for managing a correspondence for each character input mode so that a key-code generated by a key address of the same character inputted from a keyboard of a different kind becomes the same as a key-code generated by the key address inputted from a keyboard having a key arrangement assumed by a data processing program.